Continuous yarn winding machine



April 21, 1970 SCRAGG ET AL CONTINUOUS YARD WINDING MACHINE l1 Sheets-Sheet 1 Filed NOV. 2, 1967 April 21, 1970 F, sc ETAL 3,507,453

CONTINUOUS YARD WINDING MACHINE Filed Nov. 2, 1967 11 Sheets-Sheet 2 ,L lq' April 21, 1970 F SCRAGG ETAL 3,507,453

CONTINUOUS YARD WINDING MACHINE Filed Nov. 2, 1967 11 Sheets-Sheet 5 April 21, 1970 SCRAGG ET AL 3,507,453

CONTINUOUS YARD WINDING MACHINE Filed NOV. 2, 1967 ll Sheets-Sheet 4 FIGL April 21, 1970 F scR ET AL 3,507,453

CONTINUOUS YARD WINDING MACHINE Filed Nov 2, 1967 11 Sheets-Sheet s April 21, 1970 F. SCRAGG ETAL 3,507,453

CONTINUOUS YARD WINDING MACHINE 7 Filed Nov. 2, 1967 7 l1 Sheets-Sheet 6 F. SCRAGG ET AL I CONTINUOUS YARD WINDING MACHINE April 21, 1970 11 Sheets-Sheet '7 Filed NOV. 2, 1967 April 21, 1970 ll Sheets-Sheet 8 Filed Nov. 2, 1967 FIGB April 21, 1970 F. SCRAG'G ET AL 3,507,453

CONTINUOUS YARD WINDING MACHINE Filed Nov. 2, 1967 ll Sheets-Sheet 9 FIGS April 1970 F. SCRAGG ETAL CONTINUOUS YARD WINDING MACHINE Filed Nov. 2, 1967 ll Sheets-Sheet 1O April 21, 1970 F. SCRAGG ETAL 3,507,453

CONTINUOUS YARD WINDING MACHINE Filed Nov. 2, 1967 ll Sheets-Sheet 11 United States Patent 3,507,453 CONTINUOUS YARN WINDING MACHINE Frederick Scragg, Trinity, Channel Islands, Walter Parker, Wilmslow, and Alan Herbert Evans, Bramhall, England, and Walter Edouard Ernst, Guttingen, Switzerland, assignors to Ernest Scragg & Sons Limited, Macclesfield, Cheshire, England, a British company Filed Nov. 2, 1967, Ser. No. 680,105 Claims priority, application Great Britain, Nov. 7, 1966, 49,832/66 Int. Cl. B65h 54/02 U.S. Cl. 24218 40 Claims ABSTRACT OF THE DISCLOSURE A machine wherein a spool is supported by two arms which at commencement of spool exchange separate to release the full spool from contact with the bowl roll to be delivered on to auxiliary rollers which support and drive the full spool in the winding direction. The arms now swing away from the winding position to pick up an empty spool from a magazine and then swing back to bring the empty spool into driving contact with the bowl roll and with the yarn travelling to the full spool. Next the yarn is severed between the rotating full and empty spools so that the yarn is picked up by the empty spool. The support of the auxiliary rollers is now withdrawn to allow the full spool to be delivered from the machine.

This invention comprises improvements in and relating to textile machines of the class in which a yarn is wound on to a spool, or like former, such for example as spinning machines, uptwisters, downtwisters and crimping machines.

This invention provides a yarn package winding mechanism which facilitates automatic replacement of a full spool by an empty spool and consequently reduces the manual attention required in machine operation.

According to the present invention, a yarn package winding mechanism comprises a rotatable main drive roll with support means for releasably supporting a spool to contact the main drive roll and thus be rotated by the main drive roll. The yarn is guided onto the spool during rotation of the latter to form a yarn package and a rotatable auxiliary roll is positioned to receive a wound package upon release of the same from the supporting means, this being accomplished while the yarn is still being guided onto the spool from the guiding means. Rotation of the auxiliary roll rotates the released wound package. Additional means are provided for supporting a further spool in contact with the main drive roll for rotation of the further spool as the released package is rotated on the auxiliary roll. The yarn is severed between the two rolls as the wound package is rotated by its contact with the auxiliary roll. Consequently, after severing the yarn, the free end thereof commences winding upon the further spool.

By full spool or Wound package as used in this specification is to be understood a spool which has been at a winding position for a period determined either by package, or yarn delivery, measurement, or by another convenient measurement including measurement by time. Thus in some machines the dofiing mechanism of this invention ay be employed to operate in respect of individual winding positions, there being a measuring device to initiate dofiing for each such position, or in respect of groups of positions, say in response to a time control, in which case a full spool may be removed whether a particular quantity of yarn is wound on it or not.

3,507,453 Patented Apr. 21, 1970 The invention enables a tension to be maintained in the yarn being fed to the full spool until the yarn is severed. Preferably, the tension is temporarily increased as compared with the tension during winding-on of yarn, the increased tension being obtained for instance by rotating the auxiliary roll at a higher peripheral speed than the main drive roll.

By severing being effected at a position between the full and empty spools, the end of the traveling yarn can be caused to flick into sufficient contact with the empty spool as to effect pick-up and commencement of winding on the empty spool, palticularly if the yarn in travelling to the severing point runs in contact with the empty spool.

There may be two auxiliary rolls positioned so as to receive and cradle the full spool and it may be arranged that a roller is lowered, or the rollers are separated to release the full spool for delivery from the machine for instance to allow the spool to be deposited on to a conveyor or delivered to a chute leading to a storage receptacle.

Textile machines having the above and other inventive features will now be described with reference to the accompanying drawings in which:

FIGS. 1A and 1B together show diagrammatically in side elevation a false-twist machine, FIG. 1A showing the upper part and FIG. 1B the lower part,

FIG. 2 illustrates one form of severing device which may be utilised in the machine shown in FIGS. 1A and 1B,

FIG. 3 is a section on the line 33 of FIG. 2,

FIG. 4 is a view in the direction of arrow 4 on FIG. 2,

FIG. 5 is a side elevation of a form of spool support and transfer mechanism utilisable with the machine of FIGS. 1A and 1B,

FIG. 6 is a section on the line 6-6 of FIG. 5,

FIG. 7 is a section on the line 77 of FIG. 5,

FIG. 8 shows in elevation a drive arrangement suitable for use with the machine of FIGS. 1A and 1B and having features like those of FIGS. 5 to 7, and

FIGS. 9 to 11 show details of the drive.

The machine shown in FIGS. 1A and 1B is a false-twisting machine at the lower part of which are mounted creels 10 from which yarn, for example a synthetic yarn as nylon, is withdrawn by feed rollers 10a to be fed through a heater 11, a false-twister 12, and feed rollers 13 to a winding position at the top of the machine where the yarn is wound into packages on a spool or other former.

In a typical machine there will be a large number of false-twisters and corresponding winding positions along each side of the machine, and the drives for the various parts will be by shafting or belting from drive housings at one or both ends of the machine.

At each winding position there may be as shown a main drive, shown as a bowl roll 14, by which a package 15 being wound is engaged peripherally to be rotatively driven at a substantially constant peripheral speed, and reciprocating yarn guide 16 which travels on a traversing rod 17 backwards and forwards along the package to feed the yarn to the package, the reciprocating movement being devised to produce the desired type of package.

Associated with the winding positions, there is a dofi'ing mechanism so arranged as to facilitate in various ways automatic dofiing, that is removal of a package or full spool from the winding position and replacing it by an empty spool.

It is one important characteristic of the illustrated arrangement of the invention shown in FIG. 1A that the dotting operation can be carried out without stopping the yarn feed to the winding positions.

This is achieved by rotatively mounting the spool to be wound releasably in a support so that when the support is adjusted to release the full spool, the spool moves away from the traversing yarn guide 16 to be delivered into contact with an auxiliary roll drive which continues to rotate the full spool until an empty spool is held by the support in the winding position in contact with the bowl roll 14 and the yarn is severed at a point between the full and empty spools so that the yarn immediately picks up on the empty spool.

To assist in the delivery of the full spool away from the yarn guide 16 towards the centre of the machine, the package being wound with yarn has its axis offset from the vertical plane containing the axis of the bowl roll 14 towards the centre of the machine. Thus on release from the support, the full spool tends to travel gravitationally towards the machine centre as well as being carried in this direction due to its contact with the bowl roll 14.

In the arrangement illustrated, the auxiliary roll drive is effected at each position by a pair of rollers 18, which are capable of serving the two winding positions shown, and their drive is such that when serving one position the rollers 18 are driven oppositely to the directions in which they are rotated when serving the other position, this being necessary because the respective full spools will be rotating oppositely to one another. The rollers 18 are also mounted so as to be separable to the full line position shown to allow a full spool to fall on to a conveyor 19 to be carried away to a receiving position. The rollers 18 are for this purpose carried on shafts 20 which extend along the machine and are mounted in bell-cranks 21 rockable by arms 22 on shafts 23. Pin and slot connections are shown between the arms 22 and bell-cranks 21.

In falling from the winding position to the auxiliary rollers 18, the full spool is guided by an angle-section plate 24 below which a yarn severing device 25 is disposed.

As shown in FIGS. 2 to 4, the severing device consists of a pair of scissor blades 26, 27 one of which is fixed and the other of which is pivoted. The pivoted blade has a downwardly-projecting tail 28 engaged by a peg 29 on a longitudinally-reciprocable rod 30 serving a plurality of the winding positions along one side of the machine. The severing device is mounted on a bracket 31 below a slot 32 in the plate 24. When a full spool 15' is being driven by the auxiliary rollers 18 and the yarn 34 extends from it to the bowl roll 14, the yarn is traversed laterally over the surface of the plate 24 by the yarn guide 16 until the yarn enters the slot 32. The yarn 34 is now effectively guided to travel in a path through the bite between the scissor blades 26, 27 ready to be severed by rocking of the pivoted blade.

In order to improve severing of the yarn 34 and pickup of the cut end on the empty spool 35 positioned against the bowl roll 14, the full spool 15 is preferably driven by the rollers 18 at an increased speed as compared with the normal winding speed imparted by the bowl roll 14. This gives a temporarily increased tension in the yarn 34 and on being severed the severed end flicks into contact with the empty spool 35 and is readily picked up.

Arrows indicate in FIG. 2 the direction of travel of the yarn and of rotation of the spools and rollers.

The support for the spool during winding conveniently also forms a part of the transfer mechanism for delivering an empty spool into the winding position.

For instance as shown in FIG. 1A and FIGS. 5 to 7 the spool support comprises a pair of arms 40, 41 mounted on a shaft 42 which is rotatable to swing pads 43 on the ends of the arms 40, 41 between a position in which they can grip an empty spool 47 lodged between spring lips 44 at the mouth of a magazine 45 for empty spools and a winding position in contact with the bowl roll 14. The pads 43 are freely rotatable on bearings 48.

In this construction, in order to permit gripping and release of a spool, the arm 40 has a forearm portion 40a connected by a pivot pin 49 to the main portion on shaft 42 and there is provided a spring 50 urging the forearm 40a in the direction of arrow 51 (FIG. 6). The

forearm 40a has a rearward extension 4% for engagement by a quadrant striker 52 on a longitudinally-displaceable rod 53. When rod 53 is moved in the direction of arrow 54, striker 52 contacts the end of extension 40b and rocks the forearm 40a to release the spool 47 held between the pads 43. When the rod 53 is moved in the opposite direction, the forearm is released to return to the position shown in which the pads 43 grip a spool 47.

In the illustrated construction, the spool support and transfer mechanism also incorporates a friction damping mechanism (FIGS. 6 and 7) for controlling the oscillations of a package during winding, and also lost motion means allowing the arms to swing about the shaft 42 during winding and to ensure that in batch doffing rotation of the shaft 42 causes all the arms mounted on it to reach the spool-pick-up position together.

For this purpose the arms 40, 41 are journalled on the shaft 42 by bearings (FIG. 7) and a third arm 81 is rigidly secured on the shaft between them. The arm 81 has an arcuate slot 82 (FIG. 5) in its end, and a bar 83 secured by its ends in brackets 40c, 410 on the arms 40, 41 extends through the slot. The lost motion means is constituted by the bar 83 and the slot 82. The bar 83 carries friction members 84 which co-operate with the end of the arm 81 in which the slot 82 is formed.

Clearly, as the spool 47 is wound with yarn, the arms 40, 41 swing about the shaft 42 and upwards as viewed in FIG. 5, and the bar 83 moves along the slot 82. Since the arm 81 is stationary, the friction members 84 prevent undesirable oscillations of the arms 40, 41 and thus of the spool.

In dofiing, after release of the full spool, the shaft 42 is turned to rotate the arm 81 clockwise as viewed in FIG. 5, and when the bottom end of the slot 82 contacts the bar 83 the arms 40, 41 are also rotated clockwise until the pads 43 are aligned with an empty spool in the magazine lips 44.

In another form, the pair of swinging arms are bodily separable to release a spool and spring urged together to grip a spool. This can be done by providing each arm with a boss, the bosses having interengaging dogs. One boss is fixed on the rotatable shaft and the other is slidable by a longitudinally-displaceable striker along the shaft against the action of a tension spring urging the dogs into engagement.

As mentioned above, each pair of auxiliary rollers 18 serves two winding positions and for this purpose the rollers 18 are capable of being driven in either direction of rotation. When doffing is proceeding along one side of the machine, the rollers are driven in one direction, and when doffing is proceeding along the opposite side of the machine the rollers are driven in the other direction.

One method of driving the rollers 18 is shown in FIGS. 8 to 11. There are coaxial with the pivots of the bell-cranks 21 (FIG. 1A) a pair of shafts 60 which extend the full length of the machine. The shafts 60 at the drive end of the machine are capable of being coupled by respective clutches 61 (FIG. 8) to respective driving sprockets 62, 63 (FIG. 9) one of which meshes with the outside of a closed-loop driving chain 64 and the other of which meshes with the inside of the looped chain. The chain 64 also runs over guide sprockets 65, 66. By this arrangement, it will be clear that if the chain 64 is driven continuously in one direction, the sprocket 62 will be continuously rotated in the opposite direction to the sprocket 63. Thus, when doffing along one side of the machine, the sprocket 62 is clutched to its respective shaft 60 and the pair of shafts 60, which are drivingly coupled at the opposite end of the machine by a chain 67 (FIG. 11) and sprockets 68, rotate in one direction, and, when dofiing along the other side, the sprocket 63 is clutched to its shaft 60 and the shafts 60 rotate in the opposite direction.

Each shaft 60 carries a sprocket 69 for transmitting a drive up to the shafts 20 which carry the rollers 18.

The chain 64 is driven from the traversing cam 70 for the yarn guides 16 which are reciprocated by the cam through followers 71 on the yarn guide traversing rod 17. The cam 70 is itself gear driven from an electric motor (not shown).

The bowl rolls 14 are carried on parallel shafts 72 which are driven in opposite directions by having respective sprockets 73 (FIG. engaging opposite sides of a closed-loop chain 74 driven by main sprocket 75.

The sequence of operations in dofiing may conveniently be controlled by a timing mechanism particularly when gang or batch doffing is being effected.

In another arrangement, on release of a full spool from the swinging arm supports for dofiing, the spool is guided on to a pair of auxiliary rollers which during doffing can be driven at a peripheral speed up to 10% higher than that imparted by the bowl roll to give a temporary tension increase in the yarn, and after severing of the yarn, which occurs after an empty spool is ready to pick up the severed end and to wind on, one of the auxiliary rollers is lowered to remove its support for the full spool which is thereby delivered from the machine.

The timed sequence of dofling operations may be as follows:

(1) Auxiliary roll drive started,

(2) Separation of the spool support arms to release full spool on to auxiliary rollers,

(3) Yarn enters slot positioning yarn in severing mechanism,

(4) Separated arms swing up to magazine mouth and Close on to empty spool,

(5) Arms carry empty spool into contact with the bowl roll and the yarn being drawn over it,

(6) An air blower is started tending to blow the yarn against the empty, and now rotating, spool,

(7) The yarn is severed between the full and empty spools and assisted by the blower is picked up by the empty spool, and

(8) The movable auxiliary roller is lowered to deliver the full spool and then returned to its normal position.

The operations each of which depends on completion of a preceding operation can be initiated by operation of limit switches.

We claim:

1. A yarn package winding mechanism of the class comprising a rotatively-driven main drive roll, a yarn guide reciprocable relatively to the main drive roll and guiding yarn travelling towards the main drive roll to be wound on to a spool to make the package, support means supporting the package to be rotatively driven by peripheral contact with the main drive roll during winding-on of yarn, said support means being adjustable to release the wound package from said driven contact with the main drive roll, and yarn-severing means to sever yarn being fed to said package; said winding mechanism being characterized by an auxiliary roll positioned adjacent said main drive roll and receiving in peripheral contact said wound package on release from contact with the main drive roll, drive means connected rotatively to drive said auxiliary roll whereby to rotate said released wound package by peripheral contact with the auxiliary roll, said support means being further adjustable to hold an empty spool in peripheral contact with the main drive roll when the said released package is in contact with the auxiliary roll, and said yarn-severing means being positioned between the main drive roll and the auxiliary roll.

2. A yarn package winding mechanism according to claim 1, comprising a second rotativelyairiven auxiliary roll, said two auxiliary rolls being side by side and forming a support for the released package.

3. A yarn package winding mechanism as claimed in claim 1. wherein the pair of auxiliary rolls are laterally separable to permit the released package to be deposited from them.

4. A yarn package winding mechanism as claimed in claim 2, said auxiliary rolls being mounted for relative vertical displacement to release the wound package.

5. A yarn package winding mechainsm as claimed in claim 4, wherein one of the auxiliary rolls is lowerable relative to the other to effect said release of the full spool.

6. A yarn package winding mechanism as claimed in claim 5, wherein the lowerable roll is carried on swinging levers.

7. A yarn package winding mechanism as claimed in claim 6, wherein the swinging levers carry driven shafting supporting, the rolls.

8. A yarn package winding mechanism according to claim 1, comprising a second main drive roll and an as sociated yarn guide and yarn-severing means symmetrically disposed 'with respect to first said main drive roll, yarn guide and yarn-severing means, the auxiliary roll being positioned between the two main drive rolls and receiving in contact released packages from each main drive roll, the drive means of said auxiliary roll being a reversible drive.

9. A yarn package winding mechanism according to claim 8, comprising also a conveyor positioned below said auxiliary roll, and said auxiliary roll being movable to release said wound package to be deposited on the conveyor.

10. A yarn package winding mechanism according to claim 9, there being cranks carrying said auxiliary roll to release said wound package.

11. A yarn package winding mechanism as claimed in claim 8, wherein the reversible drive to the auxiliary rolls comprises an endless loop drive and a pair of rotating driving connections between the loop and the rolls of which one connection is driven from the inside of the loop and the other from the outside of the loop, there being a releasable coupling in each connection.

12. A yarn package winding mechanism as claimed in claim 11, wherein the loop drive is an endless chain and the pair of driving connections include sprockets engaging respective sides of the chain, shafts extending parallel to the auxiliary rolls and alternatively operable clutches, each clutch when operative connecting an associated one of the shafts to a corresponding one of the sprockets.

13. A yarn package winding mechanism as claimed in claim 12, comprising also a driving connection between the shafts whereby both shafts are driven irrespective of which clutch is operative.

14. A yarn package winding mechanism as claimed in claim 1, said yarn severing means comprising an anglesection plate above which the yarn travels toward the released package, the plate having in it a slot extending in the direction of yarn travel, and a cutter disposed below the slot in the plate.

15. A yarn package winding mechanism as claimed in claim 14, wherein the cutter has scissor blades and the yarn path, when the yarn is in the slot, extends between the blades.

16. A yarn package winding mechanism as claimed in claim 1, comprising a magazine for holding empty spools and having a delivery mouth at each winding position, said support means being movable to transfer an empty spool from the mouth to the winding position in contact with the main drive roll.

17. A yarn package winding mechanism according to claim 16, wherein the support means comprises arms swingable between the magazine mouth and the winding position, the bearing members being on the ends of the arms, and said bearing members being separable to allow a spool to be released and being urged together to grip a spool.

18. A yarn package winding mechanism according to claim 17, wherein the swinging arms are axially separable to release a spool and spring loaded together to grip a spool by the bearing members at their ends.

19. A yarn package winding mechanism according to claim 17, wherein one of the swinging arms is rigid and the other has a pivoted forearm carrying the associated bearing member, pivoting of the forearm eflecting release and gripping of the spools.

20. A yarn package winding mechanism as claimed in claim 17 comprising a plurality of winding stations the swinging arms being swingably mounted on a shaft, the shaft and arms being interconnected by a lost-motion mechanism whereby the arms may swing relatively to the shaft as winding proceeds and are swung by the shaft between the winding and spool-pick-up positions.

21. A yarn package winding mechanism according to claim 8, there being a second auxiliary roll positioned by the side of first said auxiliary roll, the auxiliary rolls together forming a support for said released packages.

22. A yarn package winding mechanism according to claim 21, said second auxiliary roll being connected to be driven by said drive means, the two auxiliary rolls being rotatively driven in the same direction.

23. A yarn package winding mechanism according to claim 21, there being a conveyor extending below said auxiliary rolls, said rolls being adjustable to release said released packages to be deposited on the conveyor.

24. A yarn package winding mechanism according to claim 23, there being cranks carrying the auxiliary rolls, said cranks being rockable to move the auxiliary rolls apart to release said released packages to be deposited on the conveyor.

25. A yarn package winding mechainsm according to claim 1, said drive means driving said auxiliary roll at a greater peripheral speed than that of the main drive roll.

26. A yarn package winding mechanism according to claim 1, wherein the auxiliary roll is on the side of the position occupied by a package contacting the main drive roll remote from its associated yarn guide so that the yarn travelling to a released package which is being driven by the auxiliary roll is tensioned through the winding position.

27. A yarn package winding mechanism according to claim 1, wherein the package is supported by said support means during winding to be above the auxiliary roll, whereby when the wound package is released it moves gravitationally towards the auxiliary roll.

28. A yarn package winding mechanism according to claim 27, said support means supporting a package in peripheral contact with the main drive roll and with its axis offset from a vertical plane through the main drive roll axis to the side of the plane remote from the traversing guide.

29. A yarn package winding mechanism comprising a rotatable main drive roll, support means for releasably supporting a spool to contact said main drive roll and thus be rotated by said main drive roll, means for guiding yarn onto the spool during said rotation of the latter to form a yarn package, a rotatable auxiliary roll positioned to receive a wound package upon release of the latter from said supporting means while yarn is still being guided onto said spool from said means for guiding, said auxiliary roll being rotatable to rotate the said released wound package, means for supporting a further spool in contact with said main drive roll for rotation of the further spool as the said released package is being rotated on said auxiliary roll, and means for severing the yarn between the two said rolls as the wound package is being rotated by contact with said auxiliary roll such that after severing the yarn, the free end thereof commences winding upon the said further spool.

30. A yarn package winding mechanism according to claim 29, comprising a second rotatably-driven auxiliary roll, said two auxiliary rolls being side-by-side and forming a support for the released package.

31. A yarn package winding mechanism as claimed in claim 30, wherein the pair of auxiliary rolls are laterally separable to permit the released package to be deposited from them.

v32. A yarn package winding mechanism according to claim 29, comprising a second main drive roll and an associated yarn guide and yarn-severing means symmetrically disposed 'with respect to first said main drive roll, yarn guide and yarn-severing means, the auxiliary roll being positioned between the two main drive rolls and receiving in contact released packages from each main drive roll, the drive means of said auxiliary roll being a reversible drive.

33. A yarn package winding mechanism according to claim 29, there being a second auxiliary roll positioned by the side of first said auxiliary roll, the auxiliary rolls togetherv forming a support for said released packages.

34. A yarn package winding mechanism according to claim 33, said second auxiliary roll being connected to be driven by said drive means, the two auxiliary rolls being rotatively driven in the same direction.

35. A yarn package winding mechanism according to claim 33, there being a conveyor extending below said auxiliary rolls, said rolls being adjustable to release said released packages to be deposited on the conveyor.

36. A yarn package winding mechanism according to claim 35, there being cranks carrying. the auxiliary rolls, said cranks being rockable to move the auxiliary rolls apart to release said released packages to be deposited on the conveyor.

37. A yarn package winding mechanism according to claim 29, said drive means driving said auxiliary roll at a greater peripheral speed than that of the main drive roll.

38. A yarn package winding mechanism according to claim 29, wherein the auxiliary roll is on the side of the position occupied by a package contacting the main drive roll remote from its associated yarn guide so that the yarn travelling to a released package which is being driven by the auxiliary roll is tensioned through the winding position.

3 9. A yarn package winding mechanism according to claim 29, wherein the package is supported by said support means during winding to be above the auxiliary roll, whereby when the wound package is released it moves gravitationally towards the auxiliary roll.

40. A yarn package winding mechanism according to claim 39, said support means supporting a package in peripheral contact with the main'drive roll and with its axis offset from a vertical plane through the main drive roll axis to the side of the plane remote from the traversing guide.

References Cited UNITED STATES PATENTS 2,214,332 9/1940 Kline. 2,774,211 12/1956 Sipsey 242-19 2,797,053 6/1957 Furst 24219 3,174,700 3/ 1965 Lemaire.

NATHAN L. MI'NTZ, Primary Examiner 

